Letters, Notes, and AnswersBr Med J 1911; 2 doi: https://doi.org/10.1136/bmj.2.2638.196 (Published 22 July 1911) Cite this as: Br Med J 1911;2:196
Log in using your username and password
Log in through your institution
Register for a free trial to thebmj.com to receive unlimited access to all content on thebmj.com for 14 days.
Sign up for a free trial